WESTERN POCKET GOPHER 



and about ear darker, slate-colored to black; underparts 

 warm buff, chin and sometimes breast white. Winter 

 pelage dark buffy gray above, creamy below. Total length, 

 males and females, 8.1 inches; tail vertebrae, 2.3 inches; 

 hind foot, i.i inches. Found in "Canadian Zone on Big- 

 horn Mountains, Wyoming." (Bailey) 



Pryor Mountain Pocket Gopher. — Thomomys talpoides pryori 

 (Bailey). 

 Similar to cliisiiis in size but darker in color. Upperparts 

 (summer) dull walnut-brown; nose slate-colored; black 

 about ears; dark gray on cheeks; dirty whitish to buffy on 

 feet and tail. Underparts dark buff, lacking white on chin, 

 throat, and breast. Winter pelage grayer. Total length, 

 males, 8.2 inches, females, 8.0; tail vertebrae, males, 2.4 

 inches, females, i.i; hind foot, males, 1.16 inches, females, 

 1. 14. Found in "Pryor Mountains, Mont., east to the Big- 

 horn River near Fort Custer." (Bailey) 



San Luis Pocket Gopher. — Thomomys talpoides agrcstis Mer- 

 riam. 

 Larger and paler than clusiiis. Upperparts (summer) buffy 

 to brownish gray, brightest along dorsal area ; blackish about 

 ear, grayish on nose, feet, and tail; underparts buffy, 

 occasionally with white spot on chin. Winter pelage lighter 

 and grayer. Total length, males and females, 8.8 inches; 

 tail vertebras, 2.3 inches; hind foot, 1.2 inches. Found in 

 "San Luis Valley, Colo." (Bailey) 



Columbia Pocket Gopher. — Thomomys columhianus (Bailey). 

 Smaller and paler than typical talpoides. Upperparts (sum- 

 mer) brownish gray to buffy gray ; black on ear and behind 

 ear; nose slate-colored; feet and tail grayish or whitish; 

 underparts pale buffy gray. Winter pelage grayer, but 

 very similar to summer. Total length, males and females, 

 8.3 inches; tail vertebrae, 2.3 inches; hind foot, i.i inches. 

 Found on "Plains of southeastern Washington and northern 

 Oregon." (BailejO 



Green River Pocket Gopher. — Thomomys ociiis (Merriam). 

 Small in size, pale in color. Upperparts (summer) light 

 buffy gray, with more buffy or brown from crown along 

 back; sides grayer, like cheeks, but lighter in shade; small 

 blackish patch about ear, dirty whitish on feet and tail; 

 underparts creamy to dirty whitish. Winter pelage lighter 

 above than summer. Total length, males, 8.2 inches, 

 females, 7.8; tail vertebras, males, 2.4 inches, females, 2.3; 

 hind foot, males, 1.04 inches, females, i.oo. Found in 

 "Green River Basin of southwestern Wyoming, north- 

 western Colorado, and northeastern Utah." (Bailey) 



Idaho Pocket Gopher. — Thomomys idahoetisis Merriam. 

 "Size very small; color pale yellowish gray; ears small." 

 (Bailey) Upperparts (summer) pale buffy gray, dull in 

 tone; yellowish on nose, very little dark color about ear; 

 feet and tail well haired, whitish to pale buffy; underparts 



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